update elements and fix some bugs

lib/src/iron-form/test/basic.html

Index: lib/src/iron-form/test/basic.html
diff --git a/lib/src/iron-form/test/basic.html b/lib/src/iron-form/test/basic.html
index 248431cad88844dd1bf48db62fce03e4863fde09..bacc3b29555b5d059e81040b5e64f62787b7039a 100644
--- a/lib/src/iron-form/test/basic.html
+++ b/lib/src/iron-form/test/basic.html
@@ -310,7 +310,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
       form.addEventListener('iron-form-response', function(event) {
         expect(submitted).to.be.equal(true);
 
-        var response = event.detail;
+        var response = event.detail.response;
         expect(response).to.be.ok;
         expect(response).to.be.an('object');
         expect(response.success).to.be.equal(true);
@@ -331,7 +331,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
 
       form.addEventListener('iron-form-response', function(event) {
         expect(submitted).to.be.equal(true);
-        var response = event.detail;
+        var response = event.detail.response;
         expect(response).to.be.ok;
         expect(response).to.be.an('object');
         expect(response.success).to.be.equal(true);